Rotary screen



H. W. WEIMER Aug. 18, 1931.v

ROTARY SCREEN Filed Aug. 2 1925 15 GO WE/ME/Z Patented Aug. 18, 1931 UNITED STATES PATENT oFFrc I HUGO W. WEIMER, OF MILWAUKEE, WISCONSIN ROTARY SCREEN Application filed August 26, 1925. Serial No. 52,545.

the material through the screens.

In other forms of construction the screens are carried by an outer frame which is rotatably mounted on rollers either under both ends or at the feed end only.

There are several objections to mounting a screen on ro-llers.- First it requires careful adjustment to secure proper alignment of the screen and the rollers. Further, the bearing surfaces are exposed and if a piece of rock should fall between the roller and the roller track on the screen frame the screen frame would be raised with the liability that the screen would either be Wrenched or posslbly completely thrown out of position.

One of the principal objects of this invention is toprovide a screen which is free from such defects.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the accompanying drawings.

This invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawings:

Figure 1 is a longitudinal section through a rotary screen embodying the principles of my invention.

Figure 2 is an end view of the feed end of the screen.

Figure 3 is a section on the line IIIIII of Fig. 1.

As shown on the drawings:

There is shown a screen comprising a plurality of sections, 1, 2 and 3, each having openings of progressively increasing diameter. Outside this screen running longitudinally thereof are angle bars 4. The screens are attached to these angle bars by segmental members 5 riveted or bolted to the screens and to the angle bars. The screen sections are further joined together by T section angle tie bars 27. At the feed end of the screen the angle bars are bolted to a ring or H head 6. A trunnion 22 is formed on said head 6 and is adapted to be journalled in a bearing 7 instead of resting on the usual rollers. A split, removable shell of Babbitt said trunnion. The bearing is provided with an oil or grease reservoir 8 having a hinged cap 9 therefor.

At the discharge end, which is preferably lower than the head end, the angle bars are extended beyond the end of the screen and bolted to a disc orhead 10. The disc or head 10 has inwardly projecting V-shaped extensions 28 spaced 90 apart around the circumference to which the angle bars 4 are secured, as by bolts 29. A spacer 30 is secured to each ex' tension 29 by bolts 31. Each spacer has a leg 32 adjacent the extension 28 and a leg 33 at right angles thereto which latter leg fits between the extension 28 and the ends 34 of the screen. The screen is thereby spaced from the disc 10 leaving openings 35 between the disc and the screen for the discharge of oversized material. A, 'hub or trunnion 11 integral with head 10 is journalled in a stationary bearing 12, said hub'being prefer ably hollow to permit thepassage of a water spray pipe ther'ethroughl The bearing 12-is provided with a split bearing shell 24 preferably of Babbitt metal.- A thrust ring 25' is mounted on the trunnion 11 between said bearing 12 and a flange 26 onsaid trunnion to take care of the end thrust due to the inclination of said screen.

The screen, being mounted in bearings at both ends is always in perfect alignment and there is no chance of the screen being thrown out of position by stray pieces of rock or other articles. a

The screen is driven by means of a bevel gear 13 bolted to the disc 10. In mesh with this bevel gear is a bevel pinion 14 on ashaft 15 carrying a driving pulley 16.

For feeding the material tobe screened into the screen, a trough-shaped feed spout 17 is provided extending insideof thelarge 'metal 23 forms a circular bearing surface for diameter trunnion 22. Adjacent the end of 155 one end of the same, segmental straps secured the feed spout is an inclined liner 18, conveniently formed of hardened steel to prevent excessive wear on the forward end of the screen.

After passing over the liner 18 the material strikes .the finest of the screen sections which removes the smallest particles. The latter after passing through the screen 1 fall onto another and still finer screen 19 arranged concentrically with the screen 1 and spaced therefrom. The screen 19 is supported by a series of V-shaped brackets 20 bolted to the angle bars 4 and to the screen 19.

The oversize passes along to the end of screen 3 and is discharged through the openings left between the end of the screen and the disc 10.

If desired the fine dust may be drawn through the hollow trunnion 11 and discharged into a cyclone or other form of dust settling apparatus.

I am aware thatvnumerous details of construction may be varied through a wide range Without departing from the spirit of this 1nyention, and I, therefore, do not purpose limiting the patent granted, otherwise than as necessitated by the prior art.

I claim as my invention:

1. A rotary screen comprising a perforated sectional cylinder having an uninterrupted internal passage therethrough, V-shaped angle bars extending longitudinally of said cylinder, segmental hoops secured to said angle bars and cylinder for joining the sections of the cylinder together, a closure disc at each end of the cylinder, trunnions integral with said discs, stationary bearings holding said trunnions in alignment, the trunnion at one'end of the cylinder defining a relatively large opening providing an adit for material to the screen, an inclined hardened steel liner surrounding the inner wall of the feed opening, the trunnion at the opposite end of the cylinder defining a relatively small opening, the disc at said latter end of the cylinder being spaced from theend of the screen, and exitmeans between said disc and screen for discharging oversize from said cylinder.

2. A rotary screen comprising a perforated sectional cylinder having an uninterrupted internal passage therethrough, V-shaped angle bars extending longitudinally of said cylinder, and a substantial distance beyond to said bars and cylinder to join the sections thereof together, an end disc having a large diameter hollow trunnion secured to said cylinder and angle bars at one end thereof, a second end disc having a small diameter hollow trunnion secured to the extension of said 7 angle bars, stationary bearings for said trunnions, and exit means between said second end disc and cylinder for discharging overslze from the cylinder.

scribed my name.

' HUGO WV. VVEIMER. 

